Signaling at least 100 feet before making a turn is essential for ensuring safety on the road. This distance provides sufficient time for other drivers and pedestrians to notice your intention to turn, allowing them to react appropriately. It also complies with California vehicle code, which requires drivers to indicate their intention to turn or change lanes well in advance of the maneuver.
When you signal well ahead, it helps to create a smoother flow of traffic and reduces the likelihood of accidents. For instance, drivers behind you can begin to slow down or change lanes if necessary, while pedestrians can be informed of your intended action, enhancing overall safety.
The other distances, such as 50 feet, may be too short, making it difficult for others to react in a timely manner. Signaling only at the intersection does not give other drivers enough information to anticipate your movement, increasing the risk of collision. Similarly, signaling at 200 feet may be overly cautious, but 100 feet strikes a balance that promotes safety and efficiency.